Utilities: Add the simap and netdev_provider dump commands to gdb

Utilities: Add the simap and netdev_provider dump commands to gdb

This changes add two additional gdb commands:

- ovs_dump_netdev_provider
- ovs_dump_ovs_list <struct simap *>

Here are some examples of their output:

ovs_dump_netdev_provider:
=========================

  (gdb) ovs_dump_netdev_provider
  (struct netdev_registered_class *) 0x2b2c540: refcnt = {count = 3},
      (struct netdev_class *) 0x9555c0 = {type = tap, is_pmd = false, ...},
  (struct netdev_registered_class *) 0x2b2c5a0: refcnt = {count = 2},
      (struct netdev_class *) 0xc439d8 = {type = vxlan, is_pmd = false, ...},
      (struct vport_class *) 0xc439d0 = { dpif_port = vxlan_sys, ... }
  (struct netdev_registered_class *) 0x2b2c960: refcnt = {count = 1},
      (struct netdev_class *) 0xc442f8 = {type = ip6erspan, is_pmd = false, ...},
      (struct vport_class *) 0xc442f0 = { dpif_port = ip6erspan_sys, ... }
  (struct netdev_registered_class *) 0x2b2c980: refcnt = {count = 1},
      (struct netdev_class *) 0xc44540 = {type = ip6gre, is_pmd = false, ...},
      (struct vport_class *) 0xc44538 = { dpif_port = ip6gre_sys, ... }
  (struct netdev_registered_class *) 0x2b2ebe0: refcnt = {count = 3},
      (struct netdev_class *) 0x95b8c0 = {type = dpdk, is_pmd = true, ...},

ovs_dump_ovs_list:
==================

  (gdb) b memory_report
  Breakpoint 1 at 0x753190: file lib/memory.c, line 136.
  (gdb) set want_report=1
  (gdb) c
  Continuing.

  Breakpoint 1, memory_report (usage=usage@entry=0x7fff0683d920) at lib/memory.c:136
  136	{
  (gdb) p usage
  $20 = (const struct simap *) 0x7fff0683d920
  (gdb) p* usage
  $21 = {map = {buckets = 0x2b64df0, one = 0x0, mask = 3, n = 4}}
  (gdb) p *usage
  (gdb) ovs_dump_simap usage
  handlers    : 40 / 0x28
  ports       : 6 / 0x6
  revalidators: 16 / 0x10
  rules       : 10 / 0xa

Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>